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Adding spciial case for MacOS which has a base DPI of 72.

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See issue #3547
This commit is contained in:
Hombre
2019-01-06 20:08:06 +01:00
parent 4d77e44880
commit 0407dc3487
3 changed files with 13 additions and 4 deletions
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4
rtgui/rtscalable.cc
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@@ -42,12 +42,12 @@ void RTScalable::setDPInScale (const double newDPI, const int newScale)
// HOMBRE: On windows, if scale = 2, the dpi is non significant, i.e. should be considered = 192 ; don't know for linux/macos
dpi = newDPI;
if (scale == 1) {
if (dpi >= 192.) {
if (dpi >= baseHiDPI) {
scale = 2;
}
}
else if (scale == 2) {
if (dpi < 192.) {
if (dpi < baseHiDPI) {
dpi *= 2.;
}
}

9
rtgui/rtscalable.h
View File

@@ -38,6 +38,15 @@ protected:
public:
#ifdef __APPLE__
static constexpr double baseDPI = 72;
static constexpr double baseHiDPI = 144;
#else
static constexpr double baseDPI = 96;
static constexpr double baseHiDPI = 192;
#endif
static void init(Gtk::Window *window);
static void cleanup();
static double getDPI ();

4
rtgui/rtwindow.cc
View File

@@ -188,14 +188,14 @@ RTWindow::RTWindow ()
if (isPix) {
// HOMBRE: guessing here...
// if resolution is lower than 192ppi, we're supposing that it's already expressed in a scale==1 scenario
if (resolution >= 192) {
if (resolution >= int(RTScalable::baseHiDPI)) {
// converting the resolution to a scale==1 scenario
resolution /= 2;
}
// 1pt = 1/72in @ 96 ppi
// HOMBRE: If the font unit is px, is it alredy scaled up to match the resolution ?
// px >inch >pt >"scaled pt"
pt = (int)(fontSize / 96. * 72 * (96. / resolution) + 0.49);
pt = (int)(double(fontSize) / RTScalable::baseDPI * 72. * (RTScalable::baseHiDPI / resolution) + 0.49);
} else {
pt = fontSize / Pango::SCALE;
}